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D. B. HOOVER.

SCREEN FOR STONE, SLAG, OR THE LIKE.

APPLICATION FILED MAY I2. I919.

1,3 1 4, 1 94. Patented Aug. 20, 1919.

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DAVID B. 'HOOVER, 0F POT'ISTOWN, PENNSYLVANIA.

SCREEN FOR STONE, SLAG, OR THE LIKE.

Specification of Letters Patent. Patented Aug, 26, 1919,

Application filed May 12, 1919. Serial No. 296,830.

To all whom it may concern:

Be it known that I, DAVID B. HoovER, a citizen of the United States, residing at Pottstown, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Screens for Stone, Slag, or the like, of which the following is a specification.

My invention relates to screens for stone, slag, or the like, and my object is to provide a sectional screening surface for either rotary or gravity screens the mesh of which may be readily changed in whole or in art of each section, and any worn screening ars of which may be renewed without renewing the entire section. A further object is to permit of re-using the worn bars for other or shorter sections by re-bending them to shorter lengths, and generally to prolong the life of the screen. The invention is fully described in connection with the accompanying drawing and the novel features. are pointed out in the claims.

Figure 1 is a plan view of a flat screen embodying my invention.

Fig. 2 is a longitudinal section of the same.

Fig. 3 is an enlarged plan view showing a possible arrangement of varying mesh and spacings.

Fig. 4 is a longitudinal section of Fig. i,

the removal of a screening bar for renewal being indicated in dotted lines.

' As shown in the drawing my screen is made up of sections of screening, as A, B, and C. These sections have heretoforebeen formed of metal punched to form varying meshes, which has proven unsatisfactory due to unequal wear, a worn spot in one section necessitating the entire renewal of said section at unnecessary waste of material. And when it is desired to change the mesh or have different meshin a single section, entire replacements are required which means having on hand an unnecessary supply of sections.

My improved sections are made up of screening bars, 5, indicated clearly in Figs. 3 andft, each bar formed of rectangular or square sections as desired, and having downturned ends 6 which form hooked ends. These hooked ends form engaging means for cross rods or tie-bolts 7, nuts 8 on the latter being drawn up to firmly secure the bars in place and unite them into an integral section. Spacing washers 9 on the end tie-rods retain the desired alinement and spacing of end bars and permit the nuts 8 to be firmly drawn up to unite the bars. \Vhen it is desired'to vary the mesh, additional spacing washers 10 of the required width may be employed to give any desired mesh width to the bars.- Different mesh may be employed in a given section without varying the crosssectional diameter or size of the bars.

lVhen worn bars appear in the section, new bars may be substituted, either by reassembling the sections, or, preferably, as indicated in Fig. '41, by merely loosening the end nuts and forcibly lifting the worn bar vertically out of the section against the retaining force of the slightly inturned ends. A new bar may then be substituted and the nuts drawn up. The worn bars I find may be re-used by cutting away the worn portion and bending a new hooked end, such bars being readily used again by merely collecting a whole row of them and respacing the tie-rod to suit their shorter length, also indicated in Fig. 4.

The sections are substituted for the usual sheet metal sections in a screen frame 15, as indicated in Figs. 1 and 2, the tie-rods rest-- ing on the supporting ledges 16, as indicated in sections B and C; though the bars themselves may be supported on said ledge, see section A, as the nuts so firmly unite the bars as to form a rigid structure.

I have indicated the hooked ends as being bent but slightly beyond the right-angle position in relation to the longitudinal portions of the bars, but they may be bent further to form return-bend portions; this however necessitates the entire building up of each section, and preventing the ready removal and replacement of individual bars as indicated in Fig. 4 and above described.

The use of my improved screening sections, built as above described, has proven entirely satisfactory and economical in waste of material. I am enabled to have any desired mesh of screening at the point desired without carr ingan assortment of screening sections, an the ready renewal of worn parts ermits of easily keeping all sections in the best working condition. The sections may also be readily curved for placing in rotary screens by merely loosening the nuts 8, adjusting the sections to the curve and then tightening the nuts to retain the section in its adjusted position. Different sizes of screening bars may also be readily used in a section, as indicated, and various combinaremiss tions of assembly made as best suits the material on hand and the requirements.

What I claim is: l. A section of a screen for stone, slag, or

the like, comprising series of longitudinal screening bars down-turned at their ends to form retaining hooks, a series of transverse supporting tie-rods engaged in said hooked ends, the two end ones having spacing washers between the engaged screening bars, and nuts on said tie-rods to integrally unite each section.

2. A section of a screen for stone, slag, or the like, comprising series of longitudinal screening bars down-turned at their ends to form retaining hooks, a series of transverse supporting tie-rods engaged in said hooked ends, spacing washers on certain of said tierods to vary the spacings of said screening bars, and nuts on the tie-rods to integrally unite each section.

3. A section of a screen for stone, slag, or

the like, comprising series of longitudinal screening bars of varying lengths in diflernet parallel rows down-turned at their ends to form retaining hooks, a series of transverse supporting tie-rods varyingly spaced to suit each row and engaged in said hooked ends, the two end ones having spacing washers between the engaged screening bars, and nuts on said tie-rods to integrally unite each section.

4. A screen for stone slag or the like comprising a plurality of series of longitudinal screening bars mounted at their ends to form retaining hooks, and a series of transverse supporting tie-rods engaged in said hooked ends; the bars of adjacent series being differently spaced-apart upon the transverse tie-rod forming a common support therefor, to vary the mesh.

In testimony whereof I alfix my signature.

DAVID B. HOOVER. 

